JPS6318175Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a crystal resonator, particularly to the structure of a crystal resonator in which electrodes are provided on both sides of a plate-shaped crystal piece.

A crystal resonator in which electrodes are provided on both sides of a plate-shaped crystal piece is known as an AT cut crystal resonator, for example. The crystal resonator, as shown in FIG.
For example, circular or oval excitation electrodes 2 and 3 are provided on both sides of a crystal piece 1 cut into a disc shape and polished into a flat plate shape, and the crystal piece 1 extends laterally from the excitation electrode 2.
A connecting conductor 2a reaching the edge of the excitation electrode 3 is provided.
A connecting conductor 3a is provided which extends laterally from the connecting conductor 3a and reaches the edge on the opposite side from the connecting conductor 2a. Then, clamp the connecting conductor 2a with the clip 5a provided at the tip of the lead wire 5 extending from the base 4, and
A clip 6 provided at the tip of the lead wire 6 extending from
After sandwiching the connecting conductor 3a with a, applying conductive adhesive to the connection point between the connecting conductor and the clip to ensure conductivity, and mechanically fixing the crystal piece to the base, protect it. It is covered with a protective cap.

By the way, when attaching the crystal piece to the tip of the lead wire, the above-mentioned crystal resonator requires a lot of effort to assemble, as the connecting conductor must be aligned so that it is in the position of the clip. Automatic assembly of the crystal resonator was impossible due to alignment.

This invention was made to improve the above-mentioned disadvantages, and its purpose is to connect two lead wires around a crystal piece with excitation electrodes on both sides. An object of the present invention is to provide a crystal resonator in which one lead wire is always connected to one excitation electrode and the other lead wire is connected to the other excitation electrode no matter which position of the crystal oscillator it contacts.

Next, one embodiment of the present invention will be described in detail using the drawings.

2A, as shown in FIG. 2B, the front surface S side and the back surface R side of the crystal resonator according to the present invention are opened planarly in the directions of arrows A and B, respectively;
It is a figure seen from the direction. An excitation electrode 11 is formed at the center on the surface S side. Four extraction electrodes 12a, 12b,
12c and 12d are formed. The periphery of the crystal piece 10 on the surface S side has a length of approximately 1/4 circumference,
Support electrodes 13a, 13 separated from each other
b, 13c, and 13d are formed. The extraction electrode 12a is connected to the support electrode 13a, and the extraction electrode 1
2b is connected to the support electrode 13b, and the extraction electrode 12
c is connected to the support electrode 13c, and the extraction electrode 12d
is connected to the support electrode 13d. crystal piece 10
An excitation electrode 11' is formed at the center of the back surface R side so as to overlap with the excitation electrode 11. Excitation electrode 1
Four extraction electrodes 12a' in the radial direction from the periphery of 1',
12b', 12c', and 12d' are formed. These four extraction electrodes 12a' to 12d' are formed so as not to overlap the extraction electrodes 12a to 12d on the surface S side. At a position slightly inward from the periphery on the back R side of the crystal piece 10, there is a 1/4 circumferential length.
Support electrodes 13a', 13 separated from each other
b', 13c', 13d' are formed, and these 4
The two supporting electrodes 13a' to 13d' are formed so as not to overlap the supporting electrodes 13a to 13d on the front side. The extraction electrode 12a' is connected to the support electrode 13a', the extraction electrode 12b' is connected to the support electrode 13b', the extraction electrode 12c' is connected to the support electrode 13c', and the extraction electrode 12d' is connected to the support electrode 13d'. has been done.

In addition, when forming excitation electrodes, extraction electrodes, and support electrodes on both the front and back sides of the crystal blank 10, as shown in FIG. 3, holes 21 for forming excitation electrodes, holes 22 for forming extraction electrodes, and support electrodes are formed. Prepare two masks 14 with holes 23 for the front and back sides,
After these two masks are placed on both sides of the crystal piece, aluminum is vapor-deposited from both sides of the crystal piece to form excitation electrodes, extraction electrodes, and support electrodes on both sides of the crystal piece at once.

When connecting a crystal resonator configured in this way to a lead wire, first position the tip of the lead wire 50 at an arbitrary point on the periphery of the surface S side of the crystal resonator, as shown in FIG. After making contact with the supporting electrode 13c, for example, this part is fixed with a conductive adhesive, the lead wire 50 and the excitation electrode 11 are electrically connected, and the lead wire 50 is fixed to the crystal resonator. . Further, the tip of the lead wire 60 is positioned at an arbitrary point on the support electrode provided on the back surface R side of the crystal resonator, and this part is fixed with a conductive adhesive to connect the lead wire 60 and the excitation electrode 11'. While electrically connecting, the lead wire 60 is fixed to the crystal resonator. Note that when the crystal resonator is fixed to the base 4, the crystal piece 10 is attached at an angle with respect to the line connecting the lead wires 50 and 60, as shown in FIG. 4B.

Figures 5 to 8 all show conductor layer patterns on crystal pieces showing other embodiments, and in each case, the lead conductors on the front and back sides are constructed so that they do not overlap, and the supporting conductors are They are constructed so that they do not overlap, and the stray capacitance of the crystal oscillator is minimized as much as possible. In the embodiment shown in FIG. 8, each support electrode 12, 12'
The ends of the electrodes are inclined so that the ends overlap each other when viewed from the center of the excitation electrode.

As explained in detail above, the present invention connects one lead wire at any position of the support electrode provided piecemeal around almost the entire surface side of the crystal piece, and connects the other lead wire It is connected at any position of the supporting electrodes that are provided piecemeal over almost the entire area inside the periphery of the back side of the Therefore, there is no need to worry about the conventional complication of positioning the crystal resonator and connecting the lead wires to the supporting electrodes, and it is now possible to assemble the crystal resonator fully automatically. In addition, since the leading electrodes and supporting electrodes on the front and back sides are formed so that they do not overlap each other with the crystal piece in between, the stray capacitance of the crystal resonator is small, and there are also fewer unnecessary vibrating parts of the crystal piece. Therefore, there are fewer spurious components, etc.
It has many effects.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional crystal resonator, Figure 2A
2 is a developed view of the crystal resonator according to the present invention, FIG. 2B is an explanatory diagram illustrating its development, FIG. 3 is a plan view of the mask, and FIG. 4A is a perspective view of the crystal resonator according to the present invention. Figure 4B is a top view of the same, Figures 5 to 8
The figure is an electrode pattern diagram showing another embodiment. In the figure, 10 is a crystal piece, 11 and 11' are excitation electrodes, 12, 12a, 12a', 12b, 12b', 1
2c, 12c', 12d, 12d' are extraction electrodes, 1
3, 13a, 13a', 13b, 13b', 13c,
13c', 13d, 13d' are supporting electrodes, 14 is a mask, 21, 22, 23 are holes, and 50 and 60 are lead wires.

Claims (1)

[Claims for Utility Model Registration] (1) Extraction electrodes are provided in the radial direction from the excitation electrode provided at the center of the surface of the crystal piece, and the extraction electrodes are provided piecemeal and all around the periphery of the crystal piece. An excitation electrode is connected to the supporting electrode and is located at a position facing the excitation electrode across the crystal piece in the center of the back surface of the crystal piece, and an extraction electrode is provided in a radial direction from the excitation electrode, and the extraction electrode is connected to the periphery of the crystal piece. A crystal resonator characterized in that it is connected to a supporting electrode on the inner surface side and a supporting electrode provided at a position that is not opposed to the supporting electrode across the crystal piece. (2) The crystal resonator according to claim (1) of the utility model registration claim, characterized in that the extraction electrodes provided on the front and back surfaces of the crystal piece are arranged so as not to overlap with each other across the crystal piece. .